The transformation matrix for mirroring a point in x-y plane about the line y = x is given by

A. \[\left[ {\begin{array}{*{20}{c}} { - 1}&0 \\ 0&1 \end{array}} \right]\]

B. \[\left[ {\begin{array}{*{20}{c}} 0&1 \\ 1&0 \end{array}} \right]\]

C. \[\left[ {\begin{array}{*{20}{c}} 0&{ - 1} \\ { - 1}&0 \end{array}} \right]\]

D. \[\left[ {\begin{array}{*{20}{c}} 1&0 \\ 0&{ - 1} \end{array}} \right]\]

Answer: Option B